Add DelegatingSecurityContextRepository

Issue gh-12023

web/src/main/java/org/springframework/security/web/context/DelegatingSecurityContextRepository.java

@@ -0,0 +1,111 @@
+/*
+ * Copyright 2002-2022 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.security.web.context;
+
+import java.util.Arrays;
+import java.util.List;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.springframework.security.core.context.DeferredSecurityContext;
+import org.springframework.security.core.context.SecurityContext;
+import org.springframework.util.Assert;
+
+/**
+ * @author Steve Riesenberg
+ * @author Josh Cummings
+ * @since 5.8
+ */
+public final class DelegatingSecurityContextRepository implements SecurityContextRepository {
+
+	private final List<SecurityContextRepository> delegates;
+
+	public DelegatingSecurityContextRepository(SecurityContextRepository... delegates) {
+		this(Arrays.asList(delegates));
+	}
+
+	public DelegatingSecurityContextRepository(List<SecurityContextRepository> delegates) {
+		Assert.notEmpty(delegates, "delegates cannot be empty");
+		this.delegates = delegates;
+	}
+
+	@Override
+	public SecurityContext loadContext(HttpRequestResponseHolder requestResponseHolder) {
+		return loadContext(requestResponseHolder.getRequest()).get();
+	}
+
+	@Override
+	public DeferredSecurityContext loadDeferredContext(HttpServletRequest request) {
+		DeferredSecurityContext deferredSecurityContext = null;
+		for (SecurityContextRepository delegate : this.delegates) {
+			if (deferredSecurityContext == null) {
+				deferredSecurityContext = delegate.loadDeferredContext(request);
+			}
+			else {
+				DeferredSecurityContext next = delegate.loadDeferredContext(request);
+				deferredSecurityContext = new DelegatingDeferredSecurityContext(deferredSecurityContext, next);
+			}
+		}
+		return deferredSecurityContext;
+	}
+
+	@Override
+	public void saveContext(SecurityContext context, HttpServletRequest request, HttpServletResponse response) {
+		for (SecurityContextRepository delegate : this.delegates) {
+			delegate.saveContext(context, request, response);
+		}
+	}
+
+	@Override
+	public boolean containsContext(HttpServletRequest request) {
+		for (SecurityContextRepository delegate : this.delegates) {
+			if (delegate.containsContext(request)) {
+				return true;
+			}
+		}
+		return false;
+	}
+
+	static final class DelegatingDeferredSecurityContext implements DeferredSecurityContext {
+
+		private final DeferredSecurityContext previous;
+
+		private final DeferredSecurityContext next;
+
+		DelegatingDeferredSecurityContext(DeferredSecurityContext previous, DeferredSecurityContext next) {
+			this.previous = previous;
+			this.next = next;
+		}
+
+		@Override
+		public SecurityContext get() {
+			SecurityContext securityContext = this.previous.get();
+			if (!this.previous.isGenerated()) {
+				return securityContext;
+			}
+			return this.next.get();
+		}
+
+		@Override
+		public boolean isGenerated() {
+			return this.previous.isGenerated() && this.next.isGenerated();
+		}
+
+	}
+
+}